Program rewriting system and method for a portable telephone set

a program and telephone set technology, applied in the field can solve the problems of critical blow to the sales of portable telephone sets, and the recovery of voluntary time and labor is difficul

Inactive Publication Date: 2007-02-20
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is an object of the present invention to provide a portable telephone set wherein a countermeasur

Problems solved by technology

From such significance of software, a bug upon shipment of portable telephone sets in most cases gives a critical

Method used

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  • Program rewriting system and method for a portable telephone set
  • Program rewriting system and method for a portable telephone set
  • Program rewriting system and method for a portable telephone set

Examples

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Embodiment Construction

[0014]Referring first to FIG. 1, there is illustrated an example of configuration of a memory space of a portable telephone set to which the present invention is applied. The memory space includes a ROM section 1 and a RAM section 2. Data are stored in a unit of a block in the ROM section 1.

[0015]The ROM section 1 serves as a main program storage area of the portable telephone set, and has a storage portion of a large capacity but operates in a comparatively long access cycle (read / write cycle). A nonvolatile memory such as a flash memory whose storage data are not lost even if power supply from primary and secondary cells is disconnected is used for the ROM section 1. In order to rewrite the ROM section 1, it must be placed into a special mode called IPL mode.

[0016]The RAM section 2 is a program execution area of the portable telephone set, and has a small storage area but operates in a comparatively short access cycle. A volatile memory (flash-ROM) whose storage data are not lost ...

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PUM

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Abstract

The invention provides a portable telephone set wherein a countermeasure can be taken against a bug of software by a user without the necessity for voluntary recovery by a maker. The portable telephone set has a hardware configuration which allows a user of the portable telephone set to perform an operation of downloading a modification portion of software from the outside such as a network and rewriting the software with the same. In this instance, the rewriting is performed not for the entire memory (ROM) space of the portable telephone set, but the software is divided and disposed into different blocks of the memory (ROM) space and the rewriting is performed in a unit of a block.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a portable telephone set, and more particularly to a technique of rewriting part of program data of a main memory of a portable telephone set to correct bugs of software.[0003]2. Description of the Related Art[0004]In recent years, the number of subscribers of portable telephone sets has increased and is increasing suddenly, and also the manufactured number of portable telephone sets has been and is increasing similarly. Portable telephone sets not only have mere telephone functions but also begin to have functions as an information terminal. In order to implement functions as an information terminal, development not only of hardware but also of software has significant weight. From such significance of software, a bug upon shipment of portable telephone sets in most cases gives a critical blow to sales of the portable telephone sets.[0005]Conventionally, if a bug of software occurs with...

Claims

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Application Information

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IPC IPC(8): H04L12/58G06F11/00H04M1/72406H04B7/26H04M1/00H04W8/24
CPCH04M1/72525H04W8/245H04M1/72406
Inventor SHIRAI, KOUJI
Owner NEC CORP
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